Btw... according to recently published research done by Tetra the long
held
believe that nitrosomonas and nitrobacter are the main bacteria
responcible
for the nitrogen cycle in aquaria is false. Tetra research found that
bacteria belonging to completely other sets are doing the bulk of the
work,
namely Nitrosococcus and Nitrospira.

Here's a link: http://www.marineland.com/science/nspira.asp

Keep reading. I'm willing to bet there findings have a lot to do with there
samples.

read this abstract published in 2005
http://www.ncbi.nlm.nih.gov/entrez/q...ubmed_docsu m

excerpt:
"In the Seine River estuary, especially in the salinity gradient, the
Nitrobacter proportion increases and that of Nitrospira disappears, possibly
due dilution by seawater."